Structural characteristics of a new type of weberite with the general formula (A+A3+)B5+2O2–7 with A+= Na+ or K+, A3+= a rare-earth metal cation or Y3+, and B5+= V5+ or Ta5+ are reported. The orthorhombic distortion in these compounds and the tolerance factors (t1,t2) indicative of the stability of the structures are correlated.
K. Gade and V. S. Chincholkar, J. Chem. Soc., Dalton Trans., 1979, 1959 DOI: 10.1039/DT9790001959
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